XMLBearTest: Increase XMLBearDTDUrlTest timeout

XMLBearDTDUrlTest times out regular on Travis Windows.
Increase the timeout for that test to 120s.

Related to coala#2944

tests/xml2/XMLBearTest.py

@@ -2,6 +2,9 @@
 import unittest
 
 from queue import Queue
+
+import pytest
+
 from bears.xml2.XMLBear import XMLBear
 from coalib.testing.BearTestHelper import generate_skip_decorator
 from coalib.testing.LocalBearTestHelper import verify_local_bear, execute_bear
@@ -81,6 +84,8 @@ def load_testdata(filename):
     settings={'xml_dtd': dtd_url},
     tempfile_kwargs={'suffix': '.xml'})
 
+XMLBearDTDUrlTest = pytest.mark.timeout(120, XMLBearDTDUrlTest)
+
 XMLBearRelaxNGTest = verify_local_bear(
     XMLBear,
     valid_files=(valid_xml_path,),